126121161 has 4 divisors (see below), whose sum is σ = 168161552. Its totient is φ = 84080772.

The previous prime is 126121141. The next prime is 126121169. The reversal of 126121161 is 161121621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 126121161 - 2⁶ = 126121097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126121169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21020191 + ... + 21020196.

It is an arithmetic number, because the mean of its divisors is an integer number (42040388).

Almost surely, 2^126121161 is an apocalyptic number.

It is an amenable number.

126121161 is a deficient number, since it is larger than the sum of its proper divisors (42040391).

126121161 is an equidigital number, since it uses as much as digits as its factorization.

126121161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42040390.

The product of its digits is 144, while the sum is 21.

The square root of 126121161 is about 11230.3678034159. The cubic root of 126121161 is about 501.4904341311.

Adding to 126121161 its reverse (161121621), we get a palindrome (287242782).

It can be divided in two parts, 1261 and 21161, that added together give a palindrome (22422).

The spelling of 126121161 in words is "one hundred twenty-six million, one hundred twenty-one thousand, one hundred sixty-one".